There are only a couple of cheats or glitches that can be accessed on City.
1. The rubble in the main area Near the main centre of the level turn with the two story house on your right, go left and up a small uphill path. If you stand directly centre, to your right will be an alleyway. To your left will be large rubble where you are not allowed to go. Head to the rubble where the wire fence is and face the doorway with the rubble on your left. Crouch down several feet away from the steps of the door then stand up, run to the steps and move left once you get to the top step. If you can do this, you will notice yourself moving on top of the invisible boundary set up by the level creators. The objective is to hop over the boundary. Keep doing this until you can hop over the blocks and fence to the other side.
2. The other secret area behind the main house. The main house is located pretty much in the centre of the level. It has two floors to it so it's the easiest house to identify. Go to the second floor of the house and run all the way to the path until it starts to slope down. Aim in with your pistol and tilt your nunchuck to the right as you move to the right against the rail. The objective is to get on the rail. If you start where the rail starts to slope down, you should be able to hop on the rail and go all the way to a secret area behind the house. From here you can see any enemies and anyone inside of the house.
There are several cheat or glitches areas you can access in Port. They go as follows:
1. The Sub-Dock inside: Inside where the docked submarine is, there will be a stairway which goes up but but leads to a dead end over the submarine. Go to the railway where the stairs go up on your right hand side and move left and up as if you are leaning against the rail. You should notice yourself walking above the ground. Once you come to a stack of boxes to your left you can either drop into those and hide from sight, or you can keep going. A warning though is that once in the boxes you cannot get out unless someone defeats you or you kill yourself. If you continue on, you can walk above the rail which leads out to the submarine. From there you can walk on the outside of the submarine or fall into the water.
2. The Guardhouse: This glitch is a bit more tricky in as it requires some patience to do it. Go to the backside of the guardhouse (the big circular tower) and you should notice a stariway going down and into the guardhouse. Instead of going down, head right beside the guardhouse above the stairway. Zoom in with your pistol and tilt the nunchuck to the left (extremely to the left) and get right beside the guardhouse. You should notice, if you do it correctly, that you are walking above the door. You can continue all the way around the guardhouse but if you fall behind the guardhouse, you will have to use a grenade to start over.
3. The Guardhouse 2: This glitch is extremely hard to do and I myself have only been able to do it once or twice. Head to the stariway leading down behind the guardhouse. On the third or fourth step, stop and face the medium high wall in front of you. Make an angled path to the left of your stair to the wall and then Sprint to the wall. The objective is to hop the small walkway and jump onto the wall. If you perform this correctly, you will be able to walk along the guardhouse inside of it, allowing you to see inside. Very difficult but it can be done.
This little tip is extremely useful for when you need to get a couple more bullets into the enemy. Once finished with the round of bullets in your pistol, when he is almost done reloading, tap the Z button to melee and your ammo will automatically go back to 7. Timing the cancel is tricky so it will take some time to get used to when it should be tapped.
This is the glitch in the monestary in online multiplayer.Now what you do is 1st.throw the grenade on the bottom of you in front then push foward then when you jump push back to land youre supposed to land on the top highest part if you don't crouch and stand at bottom of the door peak and run up untill you make it on when you're on go to the right and hold a+c+z and push youre nunchuck control stick to the right and twist youre entire nunchuck controller to the right too and youre supposed to be facing at the red peak of the roff while you're pushing just keep on doing it until you make it ok thats how you do it my persona is AK Reaperx and l1nkking11 and AD Danny7x if you + me just send me messages saying thanks three times and ill know it's you and to comunicate with me better join the ak clan (www.clanak.tk) and say you were recruited by me in the chatbox so thnk you guys for reading